Base 19 Repunits
Table
Format: small prime × proven prime<size> × (probable prime)<size> × [composite]<size> × {unknown}<size>
| 221: | \[{19^{221}-1\over18}\] | 599 × 29251 × 323987 × 3044803 × 133338869 × 99995282631947<14> × 3798565872679392977764923872359903722908914263900592144316654818841325041927<76> × 611131070808078653976977439974064787880277105318347996983439630790527136604777073<81> × 417761752244085564028566134452832465024215446824401694855229567186400814031217213853<84> |